JPH0136317Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field to which the invention pertains The invention relates to a gas-filled discharge tube type three-pole lightning arrester used as a communication protector to protect communication equipment from abnormal surges. This relates to a fail-safe mechanism that is easily installed to match the external shape of the three-pole lightning arrester to prevent open destruction.

(b) Prior art and its problems This type of gas-filled discharge tube triode lightning arrester for communications (hereinafter referred to as a triode lightning arrester) uses a pair of end electrodes to connect the tube ends of multiple insulated tubes with intermediate electrodes sandwiched between them. It is sealed with gas and has an approximately button shape as a whole. This three-pole arrester inevitably faces the risk of open failure due to continuous discharge. Therefore, it is desired to provide an external short circuit mechanism that does not change the internal structure. In response to such needs, the applicant has provided a variety of external shorting mechanisms. For example, as shown in Japanese Utility Model Application No. 57-126881, there is a shorting plate that is sandwiched between an intermediate electrode and an end electrode via an insulator from the outer circumferential direction of a lightning arrester. Similarly, as shown in Japanese Utility Model Application No. 56-14785, there is a shorting plate in which U-shaped shorting plates are attached to both end electrodes of a lightning arrester from the axial direction. Although this short-circuiting plate has the advantage of being able to be attached to existing surge arresters as is, it cannot be attached as is to a protector that has a mounting hole that corresponds to the outer shape of the arrester because it covers the outer periphery or both ends. That is, in 1977-
Communication protectors such as those shown in No. 163752, No. 56-99786, and No. 7 have an arc-shaped storage chamber in the insulation block that runs along the outer circumferential surface of the arrester and the length of both ends, and a storage chamber that accommodates the electrodes of the storage chamber. Since the arc-shaped electrode receiving portion is provided at the position, the shorting plate cannot be provided unless the storage structure is changed.

Other mounting structures include, for example, JP-A-55-
As shown in No. 128281, there is a type in which a shorting piece is provided in the axial direction of the lightning arrester. According to this, it is necessary to weld the shorting piece with a spot or the like, or to clamp it with a ring-shaped holder from the outer circumferential direction. The former requires welding work and is not easy to install. The latter is relatively easy to install, but similarly to the above, it cannot be attached to the protector.

By the way, since the short-circuit mechanism is a mechanism that operates when the surge arrester is finally destroyed, it is sufficient that it can prevent the worst case scenario, and it is desirable that it is inexpensive and does not deteriorate the normal performance of the surge arrester. Moreover, it is preferable that the protector has a structure that can be easily attached to the lightning arrester without changing the structure of the protector.

(c) Purpose of the invention The present invention was created in view of the above circumstances, and it can be easily installed in the axial direction of the arrester by engaging the center of the shorting piece with the terminal of the intermediate electrode. The purpose is to be able to attach it directly to an existing protector socket.

(d) Features of the invention The short-circuiting mechanism of the gas discharge tube type three-electrode lightning arrester for communication according to the invention is characterized in that the terminal of the intermediate electrode is provided with an engaging part at a position inner diameter from the flange of the end electrode, and The shorting piece is pressed against the flange via an insulating material that is melted by the discharge heat, and its approximate center is engaged with the above-mentioned engaging part. Hereinafter, the present invention will be explained based on the drawings.

(e) An embodiment of the invention Figures 1 to 3 show an embodiment of the short-circuiting mechanism of a gas-filled discharge tube type three-pole lightning arrester for communications according to the invention, and Figure 1 is a perspective view of the entirety. , FIG. 2 is an enlarged sectional view of the main part of the short-circuiting mechanism, and FIG. 3 is an enlarged sectional view of the main part showing the short-circuited state.

In the figure, 1 is a three-electrode lightning arrester, 2 is an intermediate electrode of the three-electrode lightning arrester 1, 3, 3 are a plurality of insulated tubes with the intermediate electrode 2 sandwiched between one tube end, and 4, 4 are the other tube ends of the insulated tubes 3, 3. A pair of end electrodes are provided on the inside, and a gas is sealed inside. Outer peripheral surface 3 of the above insulating tubes 3, 3
The terminal 5 of the intermediate electrode 2 and the flanges 6, 6 of the end electrodes 4, 4 protrude integrally from a, 3a, respectively, and such a structure is known.

Thus, the terminal 5 of the intermediate electrode 2 is provided with an insertion hole 7 as an engaging portion at a position radially inward from the outer diameter surface 6a of the flange portion 6 of the end electrode 4. Above insertion hole 7
Preferably, the step 1 between the upper edge 7a of the insertion hole 7 and the outer diameter surface 6a of the flange 6 is set at a position close to the outer circumferential surface 3a of the insulating tube 3. A shorting piece 8 has its center part 8a inserted into the insertion hole 7, and its both ends 8b, 8b are connected to the outer diameter surface 6a of the collar part 6, 6.
It is located at one end of 6a and is attached in the axial direction. That is, a wire such as a lead wire or another metal piece is used as the shorting piece 8, and its center portion 8a is curved by a step 1 and connected to the upper edge 7a.
Further, insulating tubes 9, 9 as an insulating material melted by discharge heat are inserted into both ends 8b, 8b, and insulation is applied to the outer diameter surfaces 6a, 6a of the flanges 6, 6 via these insulating tubes 9, 9. He was hit by bullets.

When installing the shorting piece 8, the straight shorting piece 8 is first inserted into the insertion hole 7. After that, the insulating tube 9 is inserted into the one end 8b on the insertion side, and the end 8b is elastically deformed to form the outer diameter surface 6a of the flange 6.
It is sufficient if the spring force is applied to the contact point. If the other end 8b is covered with the insulating tube 9 in advance, the other end 8b will come into contact with the outer diameter surface 6a while retaining a spring force, thus completing the installation.

According to the above configuration, the shorting piece 8 always presses both ends 8b, 8b in an insulating state with its elasticity. When the three-pole lightning arrester 1 continues to discharge and generate discharge heat due to the continuation of the abnormal surge, the insulating tube 9 melts, and the shorting piece 8 uses its elasticity to connect both ends 8b, 8b to the flanges 6, 6. A short circuit is created by contacting the outer diameter surfaces 6a, 6a.

As explained above, the above embodiment provides the following effects.

The short-circuiting mechanism could be attached using an extremely simple engagement structure in which only the insertion hole 7 was made in the terminal 5 of the intermediate electrode 2.

It can be installed by simply inserting the shorting piece 8 into the insertion hole 7.

Since the shorting piece 8 is attached as a wire in the form of an axis and is inserted into the insertion hole 7 of the intermediate electrode 2, the shorting mechanism can be configured with the smallest parts, and
Installation space can be minimized by close contact.

(F) Another Embodiment of the Invention Figure 4 is an overall perspective view showing another embodiment of the short-circuiting mechanism of the gas-filled discharge tube type three-electrode lightning arrester for communications according to the invention. The same reference numerals as those in FIGS. 3 to 3 indicate the same parts, and therefore redundant explanation will be omitted.

A notch 10 is provided at the base of the terminal 5 of the intermediate electrode 2 as an engaging portion. The notch 10 is provided in such a structure that the shorting piece 8 can be inserted into it from one side of the terminal 5. In the figure, 11 is an insulating sheet as an insulating material, and has a hole 12 in the center.

When installing the above-mentioned shorting mechanism, after inserting the insulating sheet 11 through the hole 12 into the terminal 5 of the intermediate electrode 2 and placing it on one side of the lightning arrester, insert the center of the shorting piece 8 into the notch 10 on one side of the terminal 5. When entering from 8a,
Installation is completed with spring force applied.

As described above, according to the above-mentioned embodiment, it functions as a short-circuiting mechanism, and since it is only necessary to insert the short-circuiting piece 8 from its width direction, the installation work is extremely simple. Furthermore, complete insulation can be maintained at all times using the insulating sheet.

In each of the above embodiments, the position of the engaging portion is close to the outer circumferential surface 3a of the insulating tube 3, but this is not intended to limit the position, and there is at least a step between the engaging portion and the outer circumferential surface 6a of the collar portion 6. Any position is acceptable, and the short-circuiting piece 8 may have a spring force. Moreover, it goes without saying that each of the above embodiments can be implemented in combination.

Further, although a structure is shown in which the flange 6 of the end electrode 4 is in contact with the outer circumferential surface 3a of the insulating tube 3, the flange 6 may be raised from the outer circumferential surface 3a in order to set the step 1 large. is also possible. End electrode 4
As long as it is a flange that can set a step, it is sufficient that the flange has a structure that protrudes directly from the end of the insulating tube in the radial direction without being bent, or a flange that extends to one side in the radial direction. It functions as a department. Furthermore, the insulating material melted by discharge heat is not limited to an insulating tube or an insulating sheet, and can be designed into other structures.

(g) Effects of the invention As explained above, the invention provides the following effects.

It was possible to achieve a close-fitting structure for the three-pole lightning arrester in which both ends of the shorting piece pressed against one side of the end electrode flange are only slightly exposed. the result,
Not only can the installation space for the short circuit mechanism be minimized, but also a three-pole lightning arrester equipped with a short circuit mechanism can be installed in a conventional protector without changing its socket.

The structure can be easily constructed from the terminal engaging part of the intermediate electrode and the shorting piece, and the installation work can be easily performed by simply engaging the shorting piece with the engaging part, thereby reducing manufacturing costs.

The shorting piece can be attached using the step between the end electrode flange and the terminal engaging portion, and the springiness of the step can be used to perform a highly reliable short circuit.

[Brief explanation of the drawing]

The drawings show one embodiment of the short-circuiting mechanism of the gas-filled discharge tube type triode lightning arrester for communications according to the present invention, with FIG. 1 being an overall perspective view of the same, and FIG. 2 being an enlarged cross-sectional view of the main parts of the short-circuiting mechanism. 3 is an enlarged sectional view of the same essential parts showing a short circuit state, and FIG. 4 is an overall perspective view showing another embodiment of the short circuit mechanism. 1...Gas-filled discharge tube type three-pole lightning arrester for communications, 2...
... Intermediate electrode, 3 ... Insulating tube, 3a ... Outer peripheral surface of insulating tube, 4 ... End electrode, 5 ... Terminal, 6 ... Flange, 7, 10 ... Engaging part, 8 ... Short circuit Piece, 9, 1
1...Insulating sheet.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of insulating tubes sandwiching intermediate electrodes are gas-sealed with a pair of end electrodes, and the terminals of the intermediate electrodes and the flanges of the end electrodes are connected from the outer peripheral surface of the insulating tubes. In a gas-filled discharge tube type three-electrode lightning arrester for communication, each of which has a protruding terminal, the terminal is provided with an engaging portion at an inner diameter position from the flange, and the terminal is pressed against the flange through an insulating material that is melted by discharge heat. 1. A short-circuiting mechanism for a three-electrode gas-filled discharge tube type lightning arrester for communications, characterized in that a short-circuiting piece is engaged at its substantially center with the engaging portion. (2) A short-circuiting mechanism for a gas-filled discharge tube type three-pole lightning arrester for communication, as set forth in claim 1 of the utility model registration, characterized in that the engaging portion is an insertion hole. (3) A short-circuiting mechanism for a gas-filled discharge tube type three-electrode lightning arrester for communications, as set forth in claim 1 of the utility model registration, characterized in that the engaging portion is a notch.